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High-Entropy Ultrathin Amorphous Metal–Organic Framework-Stabilized Ru(Mo) Dual-Atom Sites for Water Oxidation
ACS Energy Letters ( IF 19.3 ) Pub Date : 2024-11-06 , DOI: 10.1021/acsenergylett.4c02552
Xueqin Mu, Min Yu, Xingyu Liu, Yuru Liao, Fanjiao Chen, Haozhe Pan, Ziyue Chen, Suli Liu, Dingsheng Wang, Shichun Mu

High-entropy metal–organic frameworks (HE-MOFs) offer immense potential in electrocatalysis due to their diverse metallic compositions and high densities of active sites. Integrating bimetallic single-atom catalysts (SACs) with HE-MOFs for enhanced oxygen evolution reaction (OER) performance remains challenging. Here, we stabilize atomically dispersed Ru and Mo in amorphous HE-MOF nanosheets (HE(Ru,Mo)-MOFs) via in situ-formed amorphous high-entropy oxides, elucidating the deprotonation mechanism. Evidence supports the presence of high-density O-bridged Ru and Mo dual-atom sites. The multimetallic composition induces electronic redistribution and balances the oxidation state of metal sites, enhancing intrinsic OER activity. HE(Ru,Mo)-MOFs exhibit low OER overpotentials of 267 mV@10 mA cm–2 and 266 mV@10 mA cm–2 in alkaline freshwater and industrial wastewater, respectively, with exceptional durability surpassing that of commercial RuO2 catalysts. Mechanistic insights reveal that high atomic dispersion facilitates rapid charge transfer and intermediate transformation, promising advanced catalysts for energy conversion.

中文翻译:


高熵超薄非晶态金属-有机框架稳定的 Ru(Mo) 双原子位点,用于水的氧化



高熵金属有机框架 (HE-MOF) 由于其多样化的金属成分和高密度的活性位点,在电催化方面具有巨大的潜力。将双金属单原子催化剂 (SAC) 与 HE-MOF 集成以增强析氧反应 (OER) 性能仍然具有挑战性。在这里,我们通过原位形成的非晶态高熵氧化物稳定非晶 HE-MOF 纳米片 (HE(Ru,Mo)-MOFs) 中原子分散的 Ru 和 Mo,阐明了去质子化机制。证据支持存在高密度 O 桥 Ru 和 Mo 双原子位点。多金属成分诱导电子再分布并平衡金属位点的氧化态,增强固有的 OER 活性。HE(Ru,Mo)-MOF 在碱性淡水和工业废水中分别表现出 267 mV@10 mA cm–2 和 266 mV@10 mA cm–2 的低 OER 过电位,具有超越商用 RuO2 催化剂的出色耐久性。机理见解表明,高原子分散性有助于快速电荷转移和中间体转化,有望成为用于能量转换的先进催化剂。
更新日期:2024-11-10
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